Electrical connection or pigtail.



A. S. McDANlEL. L'a'mcAL coNNfcTloN 0R PIGTML.

MPLSCATKON FILED JULY 3i, 1913.

1,1;69. 4 Patented May 25, 1915.

y F M672@ mi M following My inve rangement vccfnchictors tin gr bodies,

lAillilNI OFFICE.

ENNSYLVANA, ASSIGNOR TGCORLISS CARBON YLVANIA, A GRPEATION OF PENNSYLVANIA.

UAL CGCNNEGTION UR PIGiAIL.

.specification of Letters atent.

Patented May 25, 1915.

.pplcaticn filed July 3i, H213. Serial No. 782,343.

ding invented certain new and Useful ov ents in sectrical-.c' i of which the ci brushes ci dynanioelectric particularly to an inmvcved nal' 'washer or which metallic condire er connf 'cd bcn bicclr cr ether y body.

The object of provide a simple and in ensive ,means tor fastening' a flexible metallic conductor, er pig tail to an ordinary carbon brush, in such a way that there is no danger of breaking the brush, no matter how small or thin it he, l Lthe saine time, to secure a e f cti the en'iployed as machines, and ferm ci termithe flexible 'to the can conducting saine 'time previa/c a cenew V "L 1 that can ce easily detached when is were 'l 7 l lm ont, anc. in with other two types ot can i the connection isigollcws-Trans- .vm i i ,en Iii, LTipper cnc4 o.. we croci. c recessed at its cp- .e parts hereinafter gironi en tending;l beyor s or the said brush; at one end. ci the i re a slet is termed cie tending from upper end ci il i here to versely is drilled posite ends described a;

the upper end ci the blcclii; a washer fits of the bent at fastened together and obtain their electrical al s miinat nay invention is to connection by a hollow rivet I extending through the bore, and having its projecting ends beaded or upset against the washers. T he objection to this type is that in manufacture it requires the extra act of upsetting the ends of the rivet; brush is worn out, the flexible metallic conductor and 'the connectinzg` means cannot be easily detached from the carbon brush. In another type or connection, the washers are fastened together by a screw extending through the bore, the screw being held in place by a .nut screwed on the end of the screw and engaging the washer. The objection to this type of connection is that, in or v"er to sink the nut even with the surface ci' the carbon block, it is necessary to recess the bore for the reception of the washer to such a depth, that in thin or small carbon brushes, the brush is weakened so as to be easily broken, either in process of manufacture or in use.

My invention is a terminal washer of new design, for use in a carbon brush, substantially as described, in which I use neither a rivet nor a nut, and which is also so designed as to give better electrical connection between the flexible metallic conductor the screw.

in the accompanying drawings, I have illustrated the carbon block of which my invention is part, and the terminal washer of new design, which is my invention.

Figure l'is an illustration of a cross section of the carbon block with my invention attached and used therein. Fig. 2 is a perspective view oi' the block with my inven'- tion attached and used therein. Fig. 3 is a perspective view of the terminal washer, which is my invention. Fig. 4 is a cross section of the terminal washer, which is my invention.

The; terniina'i washer is a circular ring with a short tubular extension in' which the line strands of copper wires forming the pig tail itself are secured. The side of the washer adjacent to the tubular eX- tension is hollow, so that the strands of copper wire may extend to the center of the washer. This allows the wire strands t0 come in direct contact with the screw, afterdescribed, thereby giving a better electrical connection betweenE the flexible metallic conductor andthe carbon brush. In the center of the washer a Vhole is swaged large enough and when the g agarose Yto admit the end of the screw which connects the two Washers, and the metallic projection `formedby this swaginf; is of a size to enter the bore or hole through the carbon block, and the inside of this projection is threaded to engage the screw which connects the two Washers. ln this Way I dispense with a nut to hold the screw and it is necessary to cut a recess in the carbon block around the end of the bore only as deep as the thickness oi' the terminal Washer. ln Figs. l and 2 of the drawings, l represents the brush made of carbon or some analogous material. 'Z' represents the hole or bore extending transversely through the upper end of the block. 9 and 10 represent the recesses at each end oil' the bore. S shows the diagonal slot extending from the bore to the upper end of the block. 2 represents a 'washer which its snugly into the recess 9 at one side of the block, and is provided vwith a tongue bent at right angles so as to extend over and against the upper end of the block. The Washer is slightly depressed around its bore to forni a rim which extends into the bore 7 of the block.

In Figs. 1, 2, 3 and il, 3 represents the terminal Washer of new design, which I claim as my invention. rlllhis terminal washer 3 its snugly into the corresponding recess l0 of the bore 7. 6 represents the extension. This extension is hollow and extends to the circumference of the Washer. Inserted in the tubulares tension 6 are fine strands of copper vvire 5, which extends to the swag'ed hole of the Washer. ll represents the hole at the center of the Washer,

formed by swaging the metal,ithe c ll'ar formed by the sivaging et the metal ling threaded. This strand is engagediby the i@ screw fl, which extends through the here and holds the Washers fast to the carbon block. The head of this screw is sunk Within the depression surrounding the bore of the Washer 2, and is flush with the outer edge of washer 2 What I claim as new and desire to secure by Letters Patent is ln combination, a carbon brush having a transverse bore through it from side to side, ai flexible metallic conductor having a terminal Washer, having a` central in-` turned metallic projection threaded internally and adapted to tit Within one end of saidbore, a metallic Washer similarly pro- 65 vided with a centra-l inturned projection adapted to i'it in a recess on the opposite side of the block and having a tongue or plate bent so as to extend over and against the top of said block, and means for detaohably securing said parts in theirs respective places consisting of a screw extending through the bore of the said block and having its head engaging said inturned projection of the metallic Washer andits stem engaging with said screw threaded projection of said terminal washer of the flexible conductor, substantially as described.

In testimony whereof, l ailiX my signature in presence ofk t\vo Witnesses.

- ALEX S. MGDANIEL. lNitnesses:

Gao. B. Mamas, HENRY llosnivnorrns. 

